Nitrox for 20 dives in 5 days?

[dmaziuk]

I feel better when they give me cold watermelon after the dive.

Mmm, the krentenbollen... What I don't get is all these people apparently having to end the dive in an oxygen bar, or they feel bad. Have they never heard the "so don't do it, then" doctor joke?

 

[tarponchik]

Mmm, the krentenbollen... What I don't get is all these people apparently having to end the dive in an oxygen bar, or they feel bad. Have they never heard the "so don't do it, then" doctor joke?

People who feel better breathing Nitrox can check what's wrong with them here, for example.

 

[dmaziuk]

People who feel better breathing Nitrox can check what's wrong with them here, for example.

Would it still apply to divers, though? -- on a dive we should already be getting hyperoxia from increased PPO2, if that's not enough and they also need to up O2% on top, how come they're able to function topside without an oxygen bottle.

 

[tarponchik]

Would it still apply to divers, though? -- on a dive we should already be getting hyperoxia from increased PPO2, if that's not enough and they also need to up O2% on top, how come they're able to function topside without an oxygen bottle.

Beats me. The red blood cells should be almost saturated by O2 under normal conditions (94%-100% at PO2 = 75 to 100 mm Hg), so the increased PPO2 should add more only of the physically dissolved O2, which is useless.

 

[Hatul]

To throw a monkey wrench into the argument, a small study suggested the hyperoxia from Nitrox can damage vascular endothelium. Can Nitrox Damage Blood Vessels?: Undercurrent 03/2014

 

[dmaziuk]

To throw a monkey wrench into the argument, a small study suggested the hyperoxia from Nitrox can damage vascular endothelium.

Well there's this whole Oxidative stress - Wikipedia thing. This: Effects of hyperoxia on biomarkers of oxidative stress in closed-circuit oxygen military divers - PubMed and similar articles suggest hyperoxia is not helping.

 

[tarponchik]

Well there's this whole Oxidative stress - Wikipedia thing. This: Effects of hyperoxia on biomarkers of oxidative stress in closed-circuit oxygen military divers - PubMed and similar articles suggest hyperoxia is not helping.

This argument does not work against the Nitrox addicts because they claim they "feel better" on Nitrox. This is all about feelings, like in a soap opera. Live them alone and let old man Darvin do his job.

 

[Protondecay123]

Beats me. The red blood cells should be almost saturated by O2 under normal conditions (94%-100% at PO2 = 75 to 100 mm Hg), so the increased PPO2 should add more only of the physically dissolved O2, which is useless.

I always thought that the main reason for Nitrox was decreased Nitrogen Loading into the tissues rather than a need for increased Oxygen to the tissues. The webpage reference from UCSF has to do with hypoxic patients on land, not scuba diving.

 

[dmaziuk]

I always thought that the main reason for Nitrox was decreased Nitrogen Loading into the tissues rather than a need for increased Oxygen to the tissues. The webpage reference from UCSF has to do with hypoxic patients on land, not scuba diving.

That particular tangent was about "feeling better" after a nitrox dive, and conceivable medical reasons for that. As in: none that could possibly apply to someone healthy enough to survive a dive.

 

[Protondecay123]

That particular tangent was about "feeling better" after a nitrox dive, and conceivable medical reasons for that. As in: none that could possibly apply to someone healthy enough to survive a dive.

So are you saying that the degree of nitrogen loading (and offloading) in the tissues has no perceptible feeling by the diver?